add reverse string exercise (#15)

config.json

@@ -36,6 +36,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 1
+      },
+      {
+        "slug": "reverse-string",
+        "name": "Reverse String",
+        "uuid": "fad4b5a6-6a15-4687-886c-34787df7b45e",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
       }
     ]
   },

exercises/practice/reverse-string/.docs/instructions.md

@@ -0,0 +1,7 @@
+# Instructions
+
+Reverse a string
+
+For example:
+input: "cool"
+output: "looc"

exercises/practice/reverse-string/.meta/config.json

@@ -0,0 +1,10 @@
+{
+  "blurb": "Reverse a string",
+  "authors": ["mbtools"],
+  "contributors": [],
+  "files": {
+    "solution": ["zcl_reverse_string.clas.abap"],
+    "test": ["zcl_reverse_string.clas.testclasses.abap"],
+    "example": [".meta/zcl_reverse_string.clas.abap"]
+  }
+}

exercises/practice/reverse-string/.meta/zcl_reverse_string.clas.abap

@@ -0,0 +1,17 @@
+CLASS zcl_reverse_string DEFINITION PUBLIC.
+  PUBLIC SECTION.
+    METHODS reverse_string
+      IMPORTING
+        input         TYPE string
+      RETURNING
+        VALUE(result) TYPE string.
+ENDCLASS.
+
+CLASS zcl_reverse_string IMPLEMENTATION.
+
+  METHOD reverse_string.
+    " Please complete the implementation of the reverse_string method
+    result = input.
+  ENDMETHOD.
+
+ENDCLASS.

exercises/practice/reverse-string/zcl_reverse_string.clas.abap

@@ -0,0 +1,16 @@
+CLASS zcl_reverse_string DEFINITION PUBLIC.
+  PUBLIC SECTION.
+    METHODS reverse_string
+      IMPORTING
+        input         TYPE string
+      RETURNING
+        VALUE(result) TYPE string.
+ENDCLASS.
+
+CLASS zcl_reverse_string IMPLEMENTATION.
+
+  METHOD reverse_string.
+    result = reverse( input ).
+  ENDMETHOD.
+
+ENDCLASS.

exercises/practice/reverse-string/zcl_reverse_string.clas.testclasses.abap

@@ -0,0 +1,59 @@
+CLASS ltcl_reverse_string DEFINITION FOR TESTING RISK LEVEL HARMLESS DURATION SHORT FINAL.
+
+  PRIVATE SECTION.
+    DATA cut TYPE REF TO zcl_reverse_string.
+
+    METHODS:
+      setup,
+      test_empty_string FOR TESTING,
+      test_word FOR TESTING,
+      test_capitalized_word FOR TESTING,
+      test_sentence_with_punctuation FOR TESTING,
+      test_palindrome FOR TESTING,
+      test_even_sized_word FOR TESTING.
+
+ENDCLASS.
+
+CLASS ltcl_reverse_string IMPLEMENTATION.
+
+  METHOD setup.
+    cut = NEW zcl_reverse_string( ).
+  ENDMETHOD.
+
+  METHOD test_empty_string.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->reverse_string( '' )
+      exp = '' ).
+  ENDMETHOD.
+
+  METHOD test_word.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->reverse_string( 'robot' )
+      exp = 'tobor' ).
+  ENDMETHOD.
+
+  METHOD test_capitalized_word.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->reverse_string( 'Ramen' )
+      exp = 'nemaR' ).
+  ENDMETHOD.
+
+  METHOD test_sentence_with_punctuation.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->reverse_string( `I'm hungry!` )
+      exp = `!yrgnuh m'I` ).
+  ENDMETHOD.
+
+  METHOD test_palindrome.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->reverse_string( 'racecar' )
+      exp = 'racecar' ).
+  ENDMETHOD.
+
+  METHOD test_even_sized_word.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->reverse_string( 'drawer' )
+      exp = 'reward' ).
+  ENDMETHOD.
+
+ENDCLASS.