Used *.c extension and lower case dir name

diff --git a/examples/Graphics/Bitmap/24bit_color/Makefile b/examples/graphics/bitmap/24bit-color/Makefile
similarity index 100%
rename from examples/Graphics/Bitmap/24bit_color/Makefile
rename to examples/graphics/bitmap/24bit-color/Makefile

diff --git a/examples/Graphics/Bitmap/24bit_color/README.md b/examples/graphics/bitmap/24bit-color/README.md
similarity index 100%
rename from examples/Graphics/Bitmap/24bit_color/README.md
rename to examples/graphics/bitmap/24bit-color/README.md

diff --git a/examples/Graphics/Bitmap/24bit_color/data/drunkenlogo.bin b/examples/graphics/bitmap/24bit-color/data/drunkenlogo.bin
similarity index 100%
rename from examples/Graphics/Bitmap/24bit_color/data/drunkenlogo.bin
rename to examples/graphics/bitmap/24bit-color/data/drunkenlogo.bin

diff --git a/examples/Graphics/Bitmap/24bit_color/drunkenlogo.png b/examples/graphics/bitmap/24bit-color/drunkenlogo.png
similarity index 100%
rename from examples/Graphics/Bitmap/24bit_color/drunkenlogo.png
rename to examples/graphics/bitmap/24bit-color/drunkenlogo.png

diff --git a/examples/Graphics/bitmap/24bit_color/source/main.c b/examples/graphics/bitmap/24bit-color/source/main.c
similarity index 100%
rename from examples/Graphics/bitmap/24bit_color/source/main.c
rename to examples/graphics/bitmap/24bit-color/source/main.c