module pind.samples.ja.unit_testing.unit_testing_solution_3;

import std.algorithm;

dstring toFront(dstring str, dchar letter) {
    dchar[] result = str.dup;
    partition!(c => c == letter, SwapStrategy.stable)(result);

    return result.idup;
}

unittest {
    immutable str = "hello"d;

    assert(toFront(str, 'h') == "hello");
    assert(toFront(str, 'o') == "ohell");
    assert(toFront(str, 'l') == "llheo");
}

void main() {
}