Add bytecode transformation for if statement with call of String methods

[egiptipavel]

Description

Bytecode transformation of the if statement with call of the String.equals, String.startsWith or String.endsWith method with a constant string into a sequence of comparisons of each char of the string with each char of the constant string.

For example, this code

if (a.equals("abc")) {
    // block of code
}

at the bytecode level will be transformed to this

if (a.length() == 3) {
    if (a.charAt(0) == 'a') {
        if (a.charAt(1) == 'b') {
            if (a.charAt(2) == 'c') {
                // block of code
            }
        }
    }
}

How to test

Automated tests

Run org.utbot.examples.TestBytecodeTransformation in utbot-instrumentation-tests module

Manual tests

public class Transformation {
    public boolean test1(String a) {
        if (a.equals(null)) {
            return true;
        }
        return false;
    }

    public boolean test2(String a) {
        if (a.equals("")) {
            return true;
        }
        return false;
    }

    public boolean test3(String a) {
        if (a.equals("abc")) {
            return true;
        }
        return false;
    }

    public boolean test4(String a) {
        if (a.startsWith("abc")) {
            return true;
        }
        return false;
    }

    public boolean test5(String a) {
        if (a.endsWith("def")) {
            return true;
        }
        return false;
    }

    public boolean test6(String a) {
        if (a.startsWith("")) {
            return true;
        }
        return false;
    }

    public boolean test7(String a) {
        if (a.endsWith("")) {
            return true;
        }
        return false;
    }
}

Self-check list

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• Manual tests have been provided optionally.
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