emojicode, 88 bytes

Result

WA

Code [DL]

🏁🍇
  🍮 s 🔤hello🔤
  🍮 char s 0
  😀 🍪🔤Howdy, 🔤 char🍪
🍉

stdin

01011011
10101110
11111100
00011100
11010010
10111110
10001000
01010100
10101101
00000011
10100101
11100111
11111011
10000011
11001001
00100000
10011001
11110001
01100001
00010110
01000010
10010001
01111000
00010101
00011010
10011010
00110111
00001001
11100010
10011111
00100100
00001111
00011000
00000001
10001000
01001010
10100110
01001110
01101001
00000000
00011100
00000110
10101011
11010101
00001000
11110000
11111101
00101101
00001010
11011111

stdout

Howdy, hello

stderr

⚠️ line 3 col 15 /tmp/code.emojic: Statement seems to have no effect whatsoever.
⚠️ line 3 col 8 /tmp/code.emojic: Variable "char" was never mutated; consider making it a frozen 🍦 variable.
⚠️ line 2 col 8 /tmp/code.emojic: Variable "s" was never mutated; consider making it a frozen 🍦 variable.

strace