Add 2018/bellard alt code + format/typo checks

The alt code should work for Windows, based on the author's remarks.

Format and typo check README.md file.

I believe this completes this entry's review.

2018/bellard/Makefile

@@ -115,8 +115,8 @@ OBJ= ${PROG}.o
 DATA= fruits.bin lena512.bin vintage_cars.bin Lenna.png
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################
@@ -139,6 +139,9 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
+
 # data files
 #
 data: ${DATA}