Add 2020/endoh3/run_clock.alt.sh for alt code

The alt code provided by the author back in 2020 uses Unicode but there
wasn't a script for it (the script run_clock.sh which I made some fixes
in last year was added by the judges but no version for the alt code was
added).

The scripts also have another fix in them: make clock or make clock.alt
first as if not and the program does not exist the script will happily
overwrite the C files and prevent it from being compiled. They use 'make
-B' just to be sure that it's compiled.

2020/endoh3/.gitignore

@@ -1,6 +1,8 @@
 #
 # sort with: sort -d -u
 clock
+clock.alt
+clock.alt.c
 clock.c
 *.dSYM
 indent

2020/endoh3/Makefile

@@ -113,8 +113,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG} clock
 #
-ALT_OBJ= ${PROG}.alt.o
-ALT_TARGET= ${PROG}.alt
+ALT_OBJ= ${PROG}.alt.o clock.alt.o
+ALT_TARGET= ${PROG}.alt clock.alt
 
 
 #################
@@ -146,6 +146,14 @@ alt: data ${ALT_TARGET}
 ${PROG}.alt: ${PROG}.alt.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
 
+clock.alt: clock.alt.c
+
+clock.alt.c: ${PROG}.alt.c
+	@${RM} -f $@
+	${CP} -f $< $@
+
+
+
 # data files
 #
 data: ${DATA}

2020/endoh3/README.md

@@ -41,6 +41,14 @@ make alt
 Use `prog.alt` as you would `prog` above.
 
 
+### Alternate try:
+
+```sh
+./run_clock.alt
+# And watch closely for 15-20 seconds
+```
+
+
 ## Judges' remarks:
 
 You may be tempted to use a mirror. Resist the temptation! Try figuring out how

2020/endoh3/run_clock.alt.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+make -B clock.alt || exit 1
+while true; do
+    cc -std=c11 -Wall -Wextra -pedantic -O3 clock.alt.c -o clock.alt
+    clear
+    ./clock.alt | tee clock.alt.c
+    sleep 5
+done

2020/endoh3/run_clock.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 
+make -B clock || exit 1
 while true; do
     cc -std=c11 -Wall -Wextra -pedantic -O3 clock.c -o clock
     clear