defined and implemented function to convert hex input to decimal

src/conversionOfNumbers/conversionOfNumbers.c

@@ -87,3 +87,23 @@ char* convertIntToHex(int input){
     }while(input != 0);
     return result;
 }
+
+unsigned int convertHexStrToInt(char* input){
+    unsigned int result = 0;
+    int index = strlen(input) - 1;
+    int exponent = 0;
+    while(index >= 0){
+        switch(input[index]){
+            case 'A': case 'a': result += 10 * pow(16, exponent); break;
+            case 'B': case 'b': result += 11 * pow(16, exponent); break;
+            case 'C': case 'c': result += 12 * pow(16, exponent); break;
+            case 'D': case 'd': result += 13 * pow(16, exponent); break;
+            case 'E': case 'e': result += 14 * pow(16, exponent); break;
+            case 'F': case 'f': result += 15 * pow(16, exponent); break;
+            default: result += (input[index] - '0') * pow(16, exponent); break;
+        }
+        index--;
+        exponent++;
+    }
+    return result;
+}

src/conversionOfNumbers/conversionOfNumbers.h

@@ -6,5 +6,6 @@ int binaryStrLen(int input);
 unsigned int convertBinaryStrToInt(char* input);
 char* convertIntToHex(int input);
 int hexStrLen(const int input);
+unsigned int convertHexStrToInt(char* input);
 
 #endif