I$\text{'}$m having trouble with this code in mips assembly checking if the C key is pressed.

drawmode$\_$nothing:

push ra

# Check if left mouse button is pressed

lw t$0,$ display$\_$mouse$\_$pressed

and t$0,$ t$0,$ MOUSE$\_$LBUTTON # Check if bit $0($left mouse button$)$ is set

beq t$0,0,\_$endif$\_$notclicked # If left mouse button is not pressed, skip drawing

# Set drawmode to MODE$\_$BRUSH

li t$0,$ MODE$\_$BRUSH

sw t$0,$ drawmode

# Draw a $1-$pixel$-$long line at current mouse coordinates in current color

lw a$0,$ display$\_$mouse$\_$x # Load current mouse x coordinate

lw a$1,$ display$\_$mouse$\_$y # Load current mouse y coordinate

lw a$2,$ display$\_$mouse$\_$x # Load current mouse x coordinate

lw a$3,$ display$\_$mouse$\_$y

lw v$1,$ color

jal display$\_$draw$\_$line

lw a$0,$ display$\_$mouse$\_$x # Load current mouse x coordinate

lw a$1,$ display$\_$mouse$\_$y # Load current mouse y coordinate

# Set last$\_$x and last$\_$y to current mouse coordinates

sw a$0,$ last$\_$x

sw a$1,$ last$\_$y

li t$0,$ KEY$\_$C

sw t$0,$ display$\_$key$\_$pressed

lw t$0,$ display$\_$key$\_$pressed

beq t$0,0,\_$endif$\_$notclicked

j $\_$c$\_$clicked

j $\_$endif$\_$notclicked

$\_$c$\_$clicked:

li t$0,$ MODE$\_$COLOR

sw t$0,$ drawmode

la t$9,$ display$\_$spr$\_$table

addi t$9,$ t$9,4$

#inside your

#initialize outer loop counter

li s$0,0$

#nested for loop

$\_$outer$\_$loop:

#initialize inner loop counter

li s$1,0$

$\_$inner$\_$loop:

#t$0=$ calculate x cord

mul t$1,$ s$1,8$

add t$0,$ t$1,$ PALETTE$\_$X #sprite$\_$x $=$ PALETTE$\_$X $+$ x $*8$

sb t$0,0($t$9)$

#calculate y cord

li t$1,$ PALETTE$\_$Y

mul t$1,$ s$0,8$

add t$0,$ t$1,$ PALETTE$\_$Y #sprite$\_$y $=$ PALETTE$\_$Y $+$ y $*8$

sb t$0,1($t$9)$

#calc which tile to use

li t$2,$ PALETTE$\_$TILE

add t$0,$ t$2,$ s$1$ # Calculate the tile index by adding s$1$ to PALETTE$\_$TILE

#add t$,$ t$2,$ s$0$

sb t$0,2($t$9)$

#set$\_\_$tile$($sprite$\_$index, PALETTE$\_$TILE $+$ sprite$\_$index $-1)$

#flags are just $1$

li t$0,1$

sb t$0,3($t$9)$

#finally, add $4$ to t$9$ to move to the next sprite

add t$9,$ t$9,4$

#inner loop increment and branch here

add s$1,$ s$1,1$

blt s$1,8,\_$inner$\_$loop

#outer loop increment and branch here

add s$0,$ s$0,1$

blt s$0,2,\_$outer$\_$loop

$\_$endif$\_$notclicked:

pop ra

jr ra