I'M THE MOST STUPID PERSON EVER

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In my final year project the aim is to adapt life forms to an environment using Genetic Algorithms. For around 1.5 months I've been really puzzled - my life forms were only ever evolving to move in a straight line, when there were functions implemented to allow it to turn left and right. While the objective was accomplished - they were evolving to pick up more food. Sadly, life forms which move in a straight line would look pretty crap in a demonstration of my project. My LifeForm class has a field 'angle' which represents the angle it faces.

public class LifeForm {
     private int angle;
}

Turns out my LifeForm.turnLeft() was:

public void turnLeft(int angle) {
     angle += angle;
}

Changing it to:

public void turnLeft(int angle) {
     this.angle += angle;
}

(Obviously) fixes everything. FUCK. 5 letters. ADDING FIVE LETTERS KILLED THE BUG. I'VE BEEN PANICKING ABOUT THIS FOR SO LONG

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