Introduce Chars

This improves the implementation by introducing a class to manage the characters

pull_and_optimize.sh

@@ -25,10 +25,9 @@ while [ -L "${SCRIPT_PATH}" ]; do
 done
 SCRIPT_PATH="$(readlink -f "${SCRIPT_PATH}")"
 SCRIPT_DIR="$(cd -P "$(dirname -- "${SCRIPT_PATH}")" >/dev/null 2>&1 && pwd)"
-set -x
-cd ${SCRIPT_DIR}
-git pull
-docker build -t ilp_keyboard_layout_optimization:latest docker/
+cd ${SCRIPT_DIR} && \
+git pull && \
+docker build -t ilp_keyboard_layout_optimization:latest docker/ && \
 docker run -it --rm ilp_keyboard_layout_optimization \
   ${1:--m ilp_keyboard_layout_optimization.optimize}