# i_have_an_idea_now.zig -rw-r--r-- 272 bytes View raw 
                                                                                
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const std = @import("std");
const mem = std.mem;
const assert = std.debug.assert;

test "string" {
    var str = "hello";
    var replacement = "rr";
    str[2..4].ptr.* = replacement[0];
    (str[2..4].ptr + 1).* = replacement[1];
    assert(mem.eql(u8, str, "herro"));
}