Add exercise update to ExerciseController

application/module-exercise/src/main/java/org/fuseri/moduleexercise/exercise/ExerciseController.java

 package org.fuseri.moduleexercise.exercise;
 
+import jakarta.persistence.EntityNotFoundException;
 import org.fuseri.model.dto.common.Result;
 import org.fuseri.model.dto.exercise.ExerciseCreateDto;
 import org.fuseri.model.dto.exercise.ExerciseDto;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
+import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
 
 /**
  * Represent a REST API controller for exercises
@@ -67,4 +70,26 @@ public class ExerciseController {
         return mapper.toResult(exercise);
     }
 
+    /**
+     * Update an existing exercise
+     *
+     * @param id  the ID of the exercise to update
+     * @param dto the ExerciseCreateDto object containing information about the exercise to update
+     * @return an ExerciseDto object representing the updated exercise
+     */
+    @PutMapping("/{id}")
+    public ExerciseDto update(@PathVariable String id, @RequestBody ExerciseCreateDto dto) {
+        Exercise exercise = mapper.fromCreateDto(dto);
+        exercise.setId(id);
+
+        try {
+            Exercise updatedExercise = service.update(exercise);
+            return mapper.toDto(updatedExercise);
+        } catch (IllegalArgumentException e) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Null exercise");
+        } catch (EntityNotFoundException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Exercise not found with id: " + id);
+        }
+    }
+
 }
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