final char[] c = new char[2 * size];
        for (int i = 0, j = 0; i < size; i++) {
            c[j] = HEX_DIGITS[src[srcIndex + i] >> 4 & 0x0F];
            j++;
            c[j++] = HEX_DIGITS[src[srcIndex + i] & 0x0F];
        }
        return new String(c);
    }

    /**
     * Converts a byte array to a hexadecimal string representation.
     *

      }

      while (!encodedCharBuffer.exhausted()) {
        val b = encodedCharBuffer.readByte().toInt() and 0xff
        writeByte('%'.code)
        writeByte(HEX_DIGITS[b shr 4 and 0xf].code)
        writeByte(HEX_DIGITS[b and 0xf].code)
      }
    } else {
      // This character doesn't need encoding. Just copy it over.
      writeUtf8CodePoint(codePoint)
    }
    i += Character.charCount(codePoint)

        size = size % 2 == 0 ? size / 2 : size / 2 + 1;
        for (int i = 0, j = 0; i < size; i++) {
            c[j] = HEX_DIGITS[src[i] >> 4 & 0x0F];
            j++;
            if (j == c.length) {
                break;
            }
            c[j++] = HEX_DIGITS[src[i] & 0x0F];
        }
        return new String(c);
    }

    /**

    }

    @Test
    @DisplayName("Should verify HEX_DIGITS constant")
    void testHexDigitsConstant() {
        // Verify the HEX_DIGITS array contains correct values
        assertEquals(16, Hexdump.HEX_DIGITS.length);
        assertEquals('0', Hexdump.HEX_DIGITS[0]);
        assertEquals('9', Hexdump.HEX_DIGITS[9]);
        assertEquals('A', Hexdump.HEX_DIGITS[10]);
        assertEquals('F', Hexdump.HEX_DIGITS[15]);
    }

decimal_exponent  = ( "e" | "E" ) [ "+" | "-" ] decimal_digits .

hex_float_lit     = "0" ( "x" | "X" ) hex_mantissa hex_exponent .
hex_mantissa      = [ "_" ] hex_digits "." [ hex_digits ] |
                    [ "_" ] hex_digits |
                    "." hex_digits .
hex_exponent      = ( "p" | "P" ) [ "+" | "-" ] decimal_digits .
</pre>

<pre>
0.
72.40
072.40       // == 72.40
2.71828
1.e+0
6.67428e-11